Feed-controlling device



Jan. 15 1924.

r G. H.'GLASER FEED CONTROLLING DEVICE Filed Feb. 15 1919 Patented Jan. 15, 1924.

U Ni'i ST'E ATE-N GEORGE E. GLASER, OF CLAREMONT, NEW HAMPSHIRE, assrenonao SULLIVAN MACHINERY COMPANY, A coarona rrou or MASSACHUSETTS.-

FEED CONTROLLING DEVICE.

Application filed February 15, 1919. Serial No. 277,348.

To all 10. mm it may cancer-u.

Be it known that I, GnoReE GLAsER, a citizen of the United States, residing at (.lareinont, in the county of Sullivan and State of New Hampshire, have invented certain new and useful Improvements in Feedfcntrolling Devices, of which the following a full, clear. and exact specification.

This invention relates to feed controlling dciices, and more especially, though not exclusively, to means .for controlling the acrion of the pressure fluid cylinder and piston of a pressure fluid impacttool, such, for example, as a stoping rock drill.

My invention has for its object to provide an improved feed varying means. It is another object of my inventionto provide an improved feed controlling attachment which may be applied to a tool feeding device with a minimum change in the structure of the device. Still another object of my invention is to provide an improved adjustable braking means of rugged construction and L'UHIPOSGt'l of a minimum number of parts. These and other objects and advantages will. however, hereinafter more fully appear.

In the accompanying drawings I have shown, for purposes of illustration, several embodiments which my invention may assume in practice.

In these drawings,-

Fig. l is a side'elevation of a stoping drill provided with my improved brakingmeans.

Fig. 2 is a longitudinal sectional view substantially on the line 2-2 of Fig. 1.

Fig. 3 is a transverse sectional view on line 33 of Fig. 2.

Fig. i is a transverse sectional vie-w on line 4-4 of Fig. 2.

Fig. 5 is a longitudinal sectional view of a modified form of one end of the stoping drill.

Fig. 6 is a transverse sectional view similar to Fig. 4, showing a modification.

Fig. 7 is a transverse section on the line 7-7 of Fig. 2.

In these illustrative construct-ions, I have shown a pneumatic hammer 1 having a piston 2 movable therein and adapted in its forward movement to strike the shank end.

of a drill steel 3 to force the bit end of the latter against the material to be cut. hiiounted on the rear end of this cylinder 1 is a cylinder head block 4 which forms the forward head of an air feed cylinder 5, the latter having mounted therein an air feed piston rod 6 carrying on its inner end an air feed piston 7. Thepiston'? is prefen, ably provided in a well known manner with a plurality of cup leathers 8 to make the piston-air tightwith respect to the cylinder 5. The rear end of the air feed cylinder 5 is partially closed by a bushing 9, the air feed piston passing through an opening formed centrally therein. In stoping' drills wherein pressure fluid is admitted to both' sides of the air feed piston head, this bushe ing will constitute the rear cylinder head.

As is common in devicesof this type now used commercially, apneumatic cylinder head plug 10 is carried by the cylinder head block 4:, this plug being provlded with a collar 11 formed thereon in such a manner that it projects into the air feed cylinder and that a recess 12 is formed between this collar and the forward end of the feed cylinder. A recess 13 is formed in the feed piston 7 in axial alinement with the collar 11 in such a manner that the collar may be received'by the recessed piston head when the latter is in its innermost position, and a non-positive locking ring 1 1 is mounted in this recess 13 s to frictionally engage the outer surface of the collar 11 to hold the piston against displacement when it is desired to transport the stoping' drill.

In the use of rotator drills, it is essential that a handle, such as is shown at 15, be provided, by means ofwhich the operator may keep the pneumatic hammer from rotating during the drillingoperation, and, as is common in devices of this type, this handle is made hollow in order that it may serve as an oil reservoir. A filling cap 16 is provided on the outer end .of the handle to permit the filling of the latter with lubricant. A valve 17 is preferably mounted on the opposite side from the handle 15, this valve serving to control the pressure fluid supply from the supply line 18' to both the pneumatic feed cylinder and thepneumatic tool. Since the parts so far described are common to certain types of well known stoping drills, it is thought that a further description of these parts or their operation is unnecessary. p

In my improved braking mechanism I preferably use a cylinder 19 slidable on and lengthwise ofthe feeding cylin'der5, adjustable braking mechanism carried on one end of thecylinder 19 and adapted to frictionally engage the feed cylinder 5, and a collar 20 interconnected between the cylinder 19 and the feed piston rod 6. The collar 20 may have a threaded connection with the cylinder 19, or may, if preferred, be brazed thereto. This collar is preferably held tightly against the outer end of the feed piston rod 6 by the feed piston rod point 21 which carries a threaded section 23 threadable into the hollow rod 6. A shoulder 22 is provided adjacent the threaded section to abut against the collar 20 to hold the collar in firm frictional engagement with the piston rod 6. If desired, the point 21 may be provided with fiatted portions 24 for the reception of a wrench.

The inner end of the cylinder 19 is preferably split for some distance, as shown at 25, so as to provide two oppositely disposed sections which may be flexed toward or away from each other. The end of each of these sections or halves is formed as a U- shaped retainer 26 in which may be inserted a Ushaped liner 27 carrying a friction band 28. A is clearly shown in Fig. 3, the ends of the friction band are slightly separated so that when the two halves 26 of the end of the cylinder 19 are flexed toward each other, the lining 28 may be caused to grip the cylinder 5 tightly.

In my preferred form, the frictional controlling means preferably consists of a U- shaped split band 29 carrying lugs 30 at bothends, these lugs having on their outer surfaces outwardly inclined cam portions 31 adapted to co-act with cams 33 mounted on a rod 32 passing centrally through the cams and cam lugs. The cams 33 and an operating handle 34 are preferably attached to the rod 32 by pins 35, though it is understood that these members may be attached to the rod by any other well known means. As is clearly shown in Figs. 2 and 3, when the handle 34 is moved from a position substantially at right angles to the axis of the feed cylinder, the co-acting cam surfaces force the lugs 30 toward each other, moving the two halves 26 on the end of the cylinder 19 and causing the friction lining 28 to en-' gage the cylinder 5, the degree of frictional engagement depending upon the degree of movement of the handle 34.

If desired, the retarding device may consist only of the parts hereinbefore described and may be assembled in the manner shown in Figs. 1, 2, and 6, it being clear that when the pressure fluid is admitted to the feed cylinder 5 to act upon the feed piston 7 a part of the pressure which the pneumatic feeding device exerts upon the pneumatic tool may be neutralized by rotating the handle 34 to cause the brake lining 28 to be forced into frictional engagement with the cylinder 5. As the tool is fed toward the work, the feed piston rod, acting through the collar 20 and the cylinder 19, draws the clamping ring lengthwise of the pneumatic feed cylinder, the construction of the braking device being such that the distance to which the stoping drill may be fed is the same as when the braking device is not attached. It should be noted that with the preferred construction herein disclosed, the braking device may be applied as an attachment to any stoping drill, it only being necessary in applying the braking means to remove the point- 21, slide the guiding cylinder 19 on the feeding cylinder 5, and replace the point 21 after inserting it through the hole inthe collar- 20. Stoping drills commonly used are provided with circular piston rods 6', as shown in Fig. 6, it being unnecessary to provide a hexagonal rod as shownin Figs. 2 and 4, unless it is desired to control the path in which the handle 34 moves.

Stoping drills are used for boring holes in all directions to the horizontal, including vertical holes drilled in the roof of a mine, and stoping drills are often used for boring shaftsisubstantially vertically upward. When so used, the cuttings from the drill bit fall onto the operator and make it diflicult for him to follow the work or to Watch hiscontrolling handles. F or this reason, I preferably mount the controlling handle 34 of the braking mechanism in a predetermined position relative to the handle 18 which controls the fiow of pressure fluid. As shown, the guiding cylinder 19 may be held against rotative movement relative to the cylinder 5 by substituting for the usual cylindrical piston rod 6. shown in Fig. 6 a hexagonal rod 6 (see Figs. 2 and 4) and a bushing 9 having a mating opening therein to guide the rod 6 and to hold this rod against rotative movement. It is to be understood that the piston rod 6 and the bushing 9 may have any other regular or irregular mated surfaces for holding the rod against angular movement relative to the cylinder 5;

Since the threaded connections between the rod 6 and the point 21, the collar 20 and the cylinder 19, and the bushing 9 and the cylinder 5, are often loosened through the jarring of the machine when the latter is operating, I preferably provide means to hold these pairs of elements against relative angular movement. For this purpose I preferably provide the. bushing 9 with a hole 36 and depress a portion of the cylinder 5 into this hole. As stated above, the collar 20 may be brazed to the cylinder 19, or, if desired, a hole 38 and a depressed portion 39, similar to the hole 36 and depression 37, may be used to keep the member 20 from rotating relative to the cylinder 19. The

collar 20 may be held against rotative movement relative to the piston 6 by the use of one or several dowel pins fitted in recesses formed in the collar and piston rod. If desired, a number of holes may be formed in either the collar or the end of the piston rod, or both, and the dowel pins 40 may be made to fit in any of these pairs of holes and thereby adjust the position of the controlling handle 34 relative to the controlling handle 18. The details ofits construction will be evident from a consideration of Fig. 7

If desired, any other of a number of well 15 known means may be used for holdingthe collar 20 against rotative movement on the threaded portion 23 of the point 2.1, such as the means shown in Fig. 5, wherein the pin 21 is driven into the end of the piston rod 6, the collar 20 being held on the point 21 by a nut 42. The collar 20 is held against rotative movement on the point by a flat ting of the opposite sides of the point, as shown at 41, and by providing the collar 20 with a bore rounded on two sides and fiatted intermediate these two sides to mate with the rounded and fiatted portions on the feed piston rod point 21'.

It will be obvious that due to the polygonal shape of the rod 6 and the additional possibility of adjustment by means of the dowel pin +10 and its several holes, it is possible to arrange the handle 34 relative to the handle 18 and the lever 15 in any desired angular relation. Thereby theoperator can adjust the parts so that he can at all times have a most convenient arrangement and can also determine, when the parts cannot be conveniently looked at due to dust, spray, or other conditions, their relative positions. Simply stated, it is possible to adjust the part-s so that the handle 18 may trace any desired path relative to the lever 34.

Vhile I have in this application specifically described three embodiments which my invention may assume in practice, it is to be understood that the same are used for illustrative purposes merely and that the invention may be modified to assume various forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. The combination with Work performingmeans and feeding means therefor ineluding a. cylinder and piston, of feed controlling means movable with said piston and cooperating with said cylinder to restrain relative movements of cylinder and piston.

2. The combination with work performing means and feeding means therefor comprising a cylinder member and piston member of feed controlling means operatively connected to one of said members at its end remote from said work performing means of feed restraining means relative to which said cylinder is movable.

5. The combination with work performing means and feeding means including inner and outer telescoping members, of feed controlling means comprising a feed re straining means attached to said inner member and cooperating with said outer member.

6. The combination with, work performing means and feeding means including inner and outer telescoping members, of feed controlling means comprising a feed restraining means concentrically arranged with respect to said telescopic members and movable with the inner one and cooperating with the other.

7. The combination with work performing means, and means including a cylinder and piston for feeding said work performing means of feed controlling means comprising a feed restraining means operatively attached to said piston and frictionally engageable with said cylinder.

8. The combination with workperforming means and means including a cylinder and piston for feeding said work performing means, of feed controlling means comprising a feed restraining means operatively attached to said piston and frictionally engageable with said cylinder, and means for varying the frictional engagement between the restraining means and the cylinder.

9. The combination with work performing means and means for feeding the work performing means including a member forming a unitary structure with said work performing means and a second member telescopically arranged with respect to said first member, of a frictional feed regulating means bearing a fixed relation to said second mentioned member during relative movement of said members.

10. The combination with work performing means and means for feeding said means including a member forming a unitary structure therewith and a second member telescopically arranged with respect to said first member and havin g an abutment engaging end, of frictional feed regulating means connected to said abutment engaging end of said second mentioned member and located adjacent the opposite end thereof.

11. The combination with work performing means and means for feeding said work performing means including a cylinder, a piston therein and a piston rod, of feed restraining means comprising a member located adjacent said piston and connected to said piston red at the end thereof remote from said piston.

12. The combination with work performing means and means for feeding said work performing means, of feed regulating means comprising a member movable on said feedin}; means relatively to said first named means, and means for guiding said regulating means in its movements relative to said first named means.

13. The combination with work performing means and means for feeding said work performing means, of feed regulating means comprising a member movable on said feed ing means in any one of a plurality of guided movements relative to said first named means, and means for guiding said regulating means in any one of its movements relative to said first named means.

14:. The combination with work performirfg means and means comprising a cylinder and a piston rod for feeding said work performing means, of feed restraining means comprising a member deta-chably secured to the piston rod, a member connected thereto and disposed longitudinallyof and movable longitudinally relative to said cylinder, a cylinder engaging means carried by said last named member, and means for moving said engaging means to cause said means to en gage the cylinder.

15. The combination with work performing means and means comprising a cylinder and a piston rod movable in guidedreiation relative to said cylinder for feeding said work performing means, of feed restraining means comprising a member detaohably secured to the piston rod. a member connected thereto and disposed longitudinally of and movable longitudinally relative to said cylinder, a cylinder engaging means carried by said last named member. and means for moving said engaging means into engagement with the cylinder.

16. The combination with a stoping drill having a pneumatic tool, a pneumatic feed,- ing means, a pressure fluid controlling valve, and an operating handle therefor, of a feed varying means mounted on said feeding means and having a controlling handle adapted to maintain a fixed angular relation to said valve handle during the feeding of said tool, and means whereby said angular relation may be changed.

17. The combination with a stoping'drill having a pneumatic tool, a pneumatic feedin means, a pressure fluid controlling v ve, and an operating handle therefor,v of a feed varying means mounted on said feeding means and having a controlling handle adapted to remain in fixed angular position relative to said valve handle during feeding, and a plurality of means for varysaid angle.

l8. lhe combination with a stoping drill 7 comprising a pneumatic tool, a pneumatic feeding means therefor comprising a cylinder, a. piston, a piston rod, a pressure fluid controlling valve, and an operating handle therefor, of a feed varying means mounted on said feeding means and having a controlling handle adapted to remain in a fixed relative angular position relative to said operating handle during feeding of the tool, and means comprising guiding elements car'- ried by' said cylinder and rod for controlling the path of movement thereof.

In testimony whereof I afiix my signature.

GEORGE H. GLASER. 

